Device for producing polar oscillograms



L. W. CHUBB.

DEVICE'FOP. PRODUCI'NG POLAR OSCILLOGRAMS.

APPLICATION FILED 0CT.-6|1916.

Reissued Mar. 23, 192.0.

V01. TAGE IfA/O WlTN ESSES Z @d 4 .mf F

TToRNEy UNITED STATES PATENT OFFICE. L,

having rectangular cordinates.

passed in front of shutters 20 LEWIS W. CHUBB, OF EDGEWOOD PARK,

PENNSYLVANIA, AssIGNoIz. To wns'rINcnsIoI'Jsr.

:ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION 0F PENNSYLVANIA.

original No. 1,175,338, dated i To all whom t may concern:

l a device for'photographing a reflected ray of` light from anoscillograph upon a sensitizedcircular plate or film.

Heretofore,l oscillographs have been provided with films or fallingplates which at definite speeds to expose them to the reflected rays oflight from galvanometers for producino curves n many cases, as Whenanalyzing the waves for harmonies and when computing the powerrepresented by curves, vert the curves represented by rectangularcordinates into curves having circular or polar cordinates. Thisreplotting of the curves requires considerable time, and serious errorsare ossible by reason of mistakes made in trans erring the figures. Toovercome the aforesaid diflicultles, I provide a means for photographinglrays of light in polar or circular cordinates, as hereinafterdescribed. .y

Fi re 1 of the accompanying drawings is a ront elevational view of aphotographic device embodying my invention. Flg. 2V is a section takenalong the line II-II of Fig. 1. Fig. 3 is a side view, partially inelevation and partially in section, of the device showndn Fig. 1, and adriving motor connected thereto, and Fig. curve sheet made with thebodying my invention.

- A hollow vribbed receptacle l, having a cover 2 with a slit 3 therein,is arranged to fit any well known typeof oscillograph (not shown). Thecover 2 has a substantially -rectangular raised portion 4 which projectsover the edge of the same and has apparatus em- -a recess 5. therein inwhich operates a shut- `ter 6 having a tapered. slit 7 in a handle 8attached toits lower end. The shutter 6 is specicatim of 'asignenLetters' raient.

it is desirable to con- 4 is a specimen Y DEVICE FOR PRODUCIN G- POLAROSCILLOGRAMS.

Reissuea Mar. 23, 192e.

March/11i, "isis, serial No. 809,795, inea December l31, 1913.-Application for reissue led October 6," 1916. Serial No. 124,193.

maintained in the recess 5 by a plate 9 which v1s 'attached to theraised portion 4 of the cover member 2 by a plurality of screws 10. Theplate 9 is slightly wider than the raised portion 4 of the slipped inthe grooves (not shown) usually provided on an oscillograph for thatpurpose. The handle 8 of the shutter has a vertical slot l1 to receive ascrew 12, and a horizontal slot 13 to receive'a pin 14 that is 'attachedto one end of'a lever 15 having a pivotal suppprt upon a pin 16. Thereceptacle 1 is provided with a plurality of projections 17 and thecover 2 is provided with an equal number of projections 18 whichcoperate to fasten the cover 2 and the receptacle 1 together.

A synchronous motor 19 having a' shaft 20 is attached to the receptaclel -by any suitable means. The shaft 20 pro'ects into the receptacle 1and has attache thereto, 'near its end, a sleeve 21 upon which ismounted a supporting plate 22. The sleeve 2l is threaded to receive anut 23 which presses a washer 24 against a circular se'nsitive fihnor-plate 25.

Asis known by those versed in the art, an oscillograph is essentially agalvanometer the vibrations of which are synchronously reflected upon asensitized plate or film to reproduce a curve which is a picture of theperformanceA of the voltage or current under consideration; Hence, nofurther descriptionr of an deemed necessary for a clear understanding ofmy invention. Y

A circular film 25 is inserted in the circuusual oscillograph has a slitin it which corl responds to the slit 3 in -the cover 2 so that a ray oflight from the oscillograph (not shown) may be transmitted to the film25.

The motor 19 is started and runs at synchronous speed. When synchronismis reached, the lever 15`is depressed, thus mov'- ing the shutter 6upwardly and exposing the film 25 to a rapidly vvibrating lray ofreflected cover 2 so that it may be oscillograph is light. Usually a,basglliner zero circle is drawn on the film by a'isubsequent exposure.

with the element or galvanometer vof the."

oscillogra h so disconnected that it does not vibrate; his will producea perfect circle grains, comprising a light-proof receptacle upon thesensitized plate.

In Fig. 4` of the drawmgs are shown two curves, one representing thecurrent takenv by .a 5 kilovolt ampere transformer and the other thevoltage of the same, while the zero .line foreach is given.

`photographing; periodic. waves, and 'the s h utter need remain openonly suilicientv Itime to equally expose the entire iilm. SinceThe-device` is-particularly adaptable to Y the film is rotated insynchronism with the yperiodic Wave, the'timeof exposiire de nds onlyupon the time required to equal y expose the whole lm. The device vmaybe adapted for photographing transient or non-periodic waves if theopening in the shutter is made rectangular inform.

The slit 7 in the shutter 6 is tapered to equalize the time of exposureof .the di'erent points on the disk film. That is, the slit 7 is soshaped that, when the slit 3 is opened by moving. the shutter 6 theouter portions of the disk 25 receive the light before the innerportions, and when the slit 3 is closed, the outer portions receive thelight longerthan the inner portions, thus compensating, in a. certainmanner, -for the dierence in peripheral speed of the variousv portionsof the disk. Should vit be desired to photograph a true polar curve withits zero at a point, the slit may be extended to the center of the cover2, as will be readil understood by those versed in the art. 'lYh typebut it must be operated in s chronis'm with the circuits the curves owhich are being photographed. v While I have described m invention inits preferred form, structura modifications may be made without depart'from the scope of the same as defined 1n the -appended claims. v

I claim as my invention:

1. Ina device for producing oscillograms, the combinationwith alight-proof receptacle, of meansfor supporting a sensitized member andfor rotating the ,member at a substantially constant speed, and meansfor equally exposing all parts of thesensitized member.

' 2. In adevice for producing polar oscillograms, the combination with alight-proof receptacle, of means for rotating a sensitized film at apredetermined speed, and

means for exposing substantially `all por- Ysaid film for equal lengthstions of the of time.

3. In a device for producing olar` oscillograms, the `combination with aight-proof rece tacle, of means for rotating a sensitize film at apredetermined speed, means lfor attaching the said device operatively toe motor 19 may beof anyy therein, a shutter having a slit therein, meansfor rotating a sensltizedfilm vcontained thereinat a predetermined'speed, and a shutter having a having a trian ular shaped'slit thereinfor y triangular shaped slit therein that copercoperating with the slitto expose eachl of time 'and means for-operating the said shutter. y

6..I adevice for producing polar loscilpoint of a sensitized film anequallength l having a triangular shaped slit therein forl eqallyexposing each point of a sensitizedy fx means for operating the saidshutter, and Aa motor for rotating and supporting the film.4

7. A device-u for producing circular oscil-V l lograms comprising alight-proof receptacle having a rectangular shaped slit therein, ashutter having a triangularv shaped slit therein to coperate with therectangular shaped slit for exposing alll arts of a sensitized filmequal lengths of tlme, andmeans for rotating the sensitized film at asubstantially constant s eed. Y Y 1 8. A device or producing oscillo ams.comprising means for rotating asensltized circular nember at aredetermined constant Spee an means or ually exposing each portion ofthe said mehlber. v

leo

camera comprising a light-proofre -f ceptacle, having a rectangularshaped slit ,v a. triangular shaped slit that coperates with .therectangular shaped slit to equall expose all parts of a sensitized lm inthe 'ght-proof recep tacle and means for rotat' said lm ata'substantially constant Spee 10. A camera comprising a circular light-vproof receptacle having a,rectangu1ar slit extending alon one o havingaslit t erein for coperat' its radii, a shutter f 'with the slit in .thelightproof receptac e for ually exposing all parts of a sensitized El...

contained in the light-proof receptacle and a motor for rotating thesaid film at a predetermined constant speed.

11: A camera comprising a circular lightproof recelptacle having aarectangular slit extending-a operating with the sl1t in the light-proofreceptacle for equally exposing all parts of a ong one of its radii, ashutter havv ing a triangularsha ed slit therein for cotating the film.

circular member at l stant speed and means for sensitizedlmcontained inthe light-proof receptacle and a motor for supporting and ro- 12. Acamera comprising a circular base having a cavity therein, acover forthe cavity having a slit therein and means for securing the same to thebase, a shutter for coperating with the slit iny the cover for equallyexposing all parts -of a sensitized lm and lmeans for rotating said filmlat a predetermined speed.'

13. A device for producing oscillograms comprising means for rotating asensitized a predetermined conso exposing each portion of the saidmemberthat a contlnuous .closed'curve having polar coordinates may bephotographed. Y

14. A camera comprising a circular lightproof receptacle -having aslit-extending l along one of its ra dii,'a shutter having a slittherein for cooperating with the slit in the light-proof receptacle forexposing all parts of a sensitized circular member, and 'means forrotating the said sensitized member at a predetermined constant speed.

1,5'. In a photographic device, the combination with a light-proofreceptacle having a slit therein, of ,a shutterq having a slit thereinfory coperatin with the slit in the receptacle to `expose alI-.parts ofa sensitized circular lm, means for operating the said shutter, andmeans for rotating and supporting' the said film.'

16. In a photographic device, the combination with a llght-proofreceptacle, of

' produced.

means for rotating a sensitized circular.

member -at a predetermined speed, and

means for so exposing the said sensitized member that a continuousclosed picture may light-proof Y fparts of the sensitized member that acontinuous closed photographic -record may be 18. A 'photographic devicecomprising means for rotating a sensitized circular member at apredetermined speed'and means for so exposing each portion of the saidmember that a curve which may be obtained.

19. A- photographic device comprising means for rotating a sensitizedcircular member at a predetermined speed and means for so exposing thesaid m nfber that' a record which closes on itself vmay be obtaine i v'b 20. n a device for producing oscillograms, the combination with alight-proof receptacle', of means for supporting a sensitized circular'member and for rotating the same at a substantially constantspeed, andmeans for so exposing the said sensitized member that a continuousclosed record is produced.

In testimony whereof, I have hereunto supscribed my name this 26th dayof Sept., 19 6.

LEWIS W, CHURR,

closes yon itself

